type Type0728 = {
  username: string;
  password: string;
  uuid: number;
};
// 索引类型  keyof
type KeyOfType0728 = keyof Type0728; // 'username' | 'password' | 'uuid'

const keyof0728: KeyOfType0728 = "uuid";

type ArrayKeyofType = keyof ["1", "2", "3"]; // '0' | '1' | '2'

// const arr12: ArrayKeyofType = "reverse";
